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Respirometry for COD Fractionation of Wastewater  

Choi, Younggyun (성균관대학교 토목환경공학과)
Kim, Gyudong (서울대학교 지구환경시스템공학부)
Kim, Heejun (서울대학교 지구환경시스템공학부)
Kim, Yunjung (서울대학교 지구환경시스템공학부)
Chung, Taihak (서울대학교 지구환경시스템공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.17, no.4, 2003 , pp. 503-509 More about this Journal
Abstract
COD fractionation of primary settled municipal wastewater was conducted by respirometry. RBCOD (Readily Biodegradable COD) fraction was analyzed to be 21% of influent TCOD. However, SCOD fraction, analyzed by physical separation using $0.45{\mu}m$ membrane filter, was about 31% of TCOD. Therefore, 10% of soluble inert COD was comprised in TCOD. It means that kinetic analysis of activated sludge system was impossible because serious error would be occurred if SCOD was used as a biodegradable soluble component instead of RBCOD estimated from respirometry. In this study, RBCOD fraction of raw wastewater could be analyzed by respirometry within the error range of 57%. In addition, SBCOD (Slowly Biodegradable COD) content could be determined by kinetic simulation of the experimental results. SBCOD showed about 2-fold higher fraction (38% of TCOD) as compared with RBCOD.
Keywords
COD fractionation; RBCOD; SBCOD; respirometry;
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